The discovery of a gas giant exoplanet still in the process of forming could upend our understanding of planet formation.
The putative protoplanet has been named AB Aurigae b, and it seems to be forming at a large distance from its star, AB Aurigae, and coming together in a rather unusual way.Evidence suggests that the planet is forming through a top-down gravitational collapse of clouds of gas, rather than the more commonly accepted bottom-up model, whereby planets form from the gradual accumulation of dust and rocks.
AB Aurigae has been intensely studied in recent years. It's a very young star, still forming itself, no more than 5 million years old . What's left over of that disk will go on to form the other elements that make up a planetary system – the planets, and smaller objects like asteroids, dwarf planets, comets, and other rocks. According to our current understanding of planet formation, these smaller objects can begin to form planets in what's called the core accretion model.
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